G - Physics – 01 – F
Patent
G - Physics
01
F
G01F 1/66 (2006.01)
Patent
CA 2459091
The invention provides an optical flow meter for measuring a flow of fluid through a pipe. The optical flow meter comprises a wave energy source for generating a pair of beams, a driver for controlling the wave energy source, a modulator coupled to the wave energy source for modulating a phase of one of the pair of beams at a phase modulation frequency, a pair of fibers for directing the pair of beams in opposite directions along a path through the flow of fluid, each of the pair of fibers comprising a tip positioned to direct one of the pair of beams towards a tip of the other fiber and to receive a diffused beam from the tip of the other fiber, a detector for receiving a pair of diffused beams received by the pair of fibers and for producing an electrical signal which oscillates with the phase modulation frequency, a digital signal processor configured to receive the electrical signal and calculate a flow velocity from a phase difference between the pair of beams, a pair of collecting optical systems positioned adjacent to the tip of one of the fibers for collecting deflected wave energy from the pair of beams, and, a compensation module coupled to receive the deflected wave energy from the collecting optical systems and configured to estimate a total intensity of light received by the tips of the pair of fibers and generate a compensation signal representative of the total intensity and provide the compensation signal to the driver, whereby the driver controls the wave energy source to vary an initial intensity of the pair of beams in response to the compensation signal such that the total intensity remains constant.
Oyen Wiggs Green & Mutala Llp
Photon Control Inc.
LandOfFree
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